|-
|align = "center" bgcolor = "#9BBB59" rowspan = "2"|'''1'''
|align = "center" rowspan = "2"|'''Baker Hughes'''
|align = "center"|<font color="#0000FF"><u>[http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220100089580%22.PGNR.&OS=DN/20100089580&RS=DN/20100089580 US20100089580A1]</u></font>
|Performing fracturing method by combining proppant free stage and proppant ladden stage in two stages helps in reducing the conductivity damage.